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Which of the following is the least soluble in water?

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in Chemistry – Class 12 by (188k points)
Which of the following is the least soluble in water?

(a) Methanal

(b) Ethanal

(c) Propanone

(d) Pentanal

I got this question in my homework.

My question is from Aldehydes and Ketones Physical Properties topic in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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The correct choice is (d) Pentanal

For explanation I would say: The lower aldehydes and ketones are miscible in water in all proportions due to the ability of the polar carbonyl group to form hydrogen bonds with water molecules. However, the solubility rapidly decreases as the length of the alkyl chain increases. Precisely, aldehydes and ketones with more than 4 carbon atoms are practically insoluble in water.

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